diff --git a/src/main/java/ru/ulstu/timeline/controller/EventController.java b/src/main/java/ru/ulstu/timeline/controller/EventController.java
index 6f79b31..b2e4a23 100644
--- a/src/main/java/ru/ulstu/timeline/controller/EventController.java
+++ b/src/main/java/ru/ulstu/timeline/controller/EventController.java
@@ -13,6 +13,7 @@ import ru.ulstu.core.model.response.Response;
 import ru.ulstu.timeline.model.EventDto;
 import ru.ulstu.timeline.service.EventService;
 
+import javax.validation.Valid;
 import java.util.List;
 
 import static ru.ulstu.timeline.controller.EventController.URL;
@@ -30,16 +31,16 @@ public class EventController {
 
     @GetMapping
     public Response<List<EventDto>> getEvents() {
-        return new Response<>(eventService.findAll());
+        return new Response<>(eventService.findAllDto());
     }
 
     @PostMapping
-    public Response createEvent(@RequestBody EventDto timelineDto) {
+    public Response createEvent(@RequestBody @Valid EventDto timelineDto) {
         return new Response(eventService.create(timelineDto));
     }
 
     @PutMapping
-    public Response updateEvent(@RequestBody EventDto eventDto) {
+    public Response updateEvent(@RequestBody @Valid EventDto eventDto) {
         return new Response(eventService.update(eventDto));
     }
 
diff --git a/src/main/java/ru/ulstu/timeline/model/Event.java b/src/main/java/ru/ulstu/timeline/model/Event.java
index 89ff4cd..7ae715d 100644
--- a/src/main/java/ru/ulstu/timeline/model/Event.java
+++ b/src/main/java/ru/ulstu/timeline/model/Event.java
@@ -9,9 +9,13 @@ import javax.persistence.Entity;
 import javax.persistence.EnumType;
 import javax.persistence.Enumerated;
 import javax.persistence.FetchType;
+import javax.persistence.JoinColumn;
 import javax.persistence.ManyToMany;
+import javax.persistence.ManyToOne;
+import javax.persistence.OneToMany;
 import javax.persistence.Temporal;
 import javax.persistence.TemporalType;
+import javax.validation.constraints.NotNull;
 import java.util.Date;
 import java.util.List;
 
@@ -34,11 +38,15 @@ public class Event extends BaseEntity {
     @NotBlank
     private String title;
 
+    @Enumerated(value = EnumType.STRING)
+    private PeriodEvent period;
+
     @Enumerated(value = EnumType.STRING)
     private EventStatus status;
 
     @Column(name = "execute_date")
     @Temporal(TemporalType.TIMESTAMP)
+    @NotNull
     private Date executeDate;
 
     @Column(name = "create_date")
@@ -54,6 +62,10 @@ public class Event extends BaseEntity {
     @ManyToMany(fetch = FetchType.EAGER)
     private List<User> recipients;
 
+    @ManyToOne
+    @JoinColumn(name = "child_id")
+    private Event child;
+
     public String getTitle() {
         return title;
     }
@@ -62,7 +74,7 @@ public class Event extends BaseEntity {
         this.title = title;
     }
 
-    public EventStatus getStatus() {
+    public Event.EventStatus getStatus() {
         return status;
     }
 
@@ -70,6 +82,14 @@ public class Event extends BaseEntity {
         this.status = status;
     }
 
+    public PeriodEvent getPeriod() {
+        return period;
+    }
+
+    public void setPeriod(PeriodEvent period) {
+        this.period = period;
+    }
+
     public Date getCreateDate() {
         return createDate;
     }
@@ -109,4 +129,12 @@ public class Event extends BaseEntity {
     public void setExecuteDate(Date executeDate) {
         this.executeDate = executeDate;
     }
+
+    public Event getChild() {
+        return child;
+    }
+
+    public void setChild(Event child) {
+        this.child = child;
+    }
 }
diff --git a/src/main/java/ru/ulstu/timeline/model/EventDto.java b/src/main/java/ru/ulstu/timeline/model/EventDto.java
index b409ce8..0ec07ea 100644
--- a/src/main/java/ru/ulstu/timeline/model/EventDto.java
+++ b/src/main/java/ru/ulstu/timeline/model/EventDto.java
@@ -2,8 +2,10 @@ package ru.ulstu.timeline.model;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
+import org.hibernate.validator.constraints.NotBlank;
 import ru.ulstu.user.model.UserDto;
 
+import javax.validation.constraints.NotNull;
 import java.util.Date;
 import java.util.List;
 
@@ -11,8 +13,11 @@ import static ru.ulstu.core.util.StreamApiUtils.convert;
 
 public class EventDto {
     private final Integer id;
+    @NotBlank
     private final String title;
+    private final PeriodEvent period;
     private final Event.EventStatus status;
+    @NotNull
     private final Date executeDate;
     private final Date createDate;
     private final Date updateDate;
@@ -23,6 +28,7 @@ public class EventDto {
     public EventDto(@JsonProperty("id") Integer id,
                     @JsonProperty("title") String title,
                     @JsonProperty("status") Event.EventStatus status,
+                    @JsonProperty("period") PeriodEvent period,
                     @JsonProperty("executeDate") Date executeDate,
                     @JsonProperty("createDate") Date createDate,
                     @JsonProperty("updateDate") Date updateDate,
@@ -30,6 +36,7 @@ public class EventDto {
                     @JsonProperty("recipients") List<UserDto> recipients) {
         this.id = id;
         this.title = title;
+        this.period = period;
         this.status = status;
         this.executeDate = executeDate;
         this.createDate = createDate;
@@ -42,6 +49,7 @@ public class EventDto {
         this.id = event.getId();
         this.title = event.getTitle();
         this.status = event.getStatus();
+        this.period = event.getPeriod();
         this.executeDate = event.getExecuteDate();
         this.createDate = event.getCreateDate();
         this.updateDate = event.getUpdateDate();
@@ -57,6 +65,8 @@ public class EventDto {
         return title;
     }
 
+    public PeriodEvent getPeriod() { return period; }
+
     public Event.EventStatus getStatus() { return status; }
 
     public Date getCreateDate() {
diff --git a/src/main/java/ru/ulstu/timeline/model/PeriodEvent.java b/src/main/java/ru/ulstu/timeline/model/PeriodEvent.java
new file mode 100644
index 0000000..b5e73b8
--- /dev/null
+++ b/src/main/java/ru/ulstu/timeline/model/PeriodEvent.java
@@ -0,0 +1,24 @@
+package ru.ulstu.timeline.model;
+
+import java.time.Period;
+
+public enum PeriodEvent {
+        EVERY_YEAR(Period.ofYears(1), "Каждый год"),
+        EVERY_MONTH(Period.ofMonths(1), "Каждый месяц"),
+        EVERY_WEEK(Period.ofWeeks(1), "Каждую неделю"),
+        EVERY_DAY(Period.ofDays(1), "Каждый день");
+
+        private Period period;
+        private String message;
+
+    PeriodEvent(Period period, String message) {
+            this.period = period;
+            this.message = message;
+        }
+
+        public Period getPeriod() { return period; }
+
+        public String getMessage() {
+            return message;
+        }
+}
diff --git a/src/main/java/ru/ulstu/timeline/repository/EventRepository.java b/src/main/java/ru/ulstu/timeline/repository/EventRepository.java
index 6267d51..2829261 100644
--- a/src/main/java/ru/ulstu/timeline/repository/EventRepository.java
+++ b/src/main/java/ru/ulstu/timeline/repository/EventRepository.java
@@ -9,4 +9,7 @@ import java.util.List;
 public interface EventRepository extends JpaRepository<Event, Integer> {
     @Query("SELECT e FROM Event e WHERE e.executeDate = CURRENT_DATE")
     List<Event> findByCurrentDate();
+
+    @Query("SELECT e FROM Event e WHERE e.executeDate > CURRENT_DATE")
+    List<Event> findAllFuture();
 }
diff --git a/src/main/java/ru/ulstu/timeline/service/EventScheduler.java b/src/main/java/ru/ulstu/timeline/service/EventScheduler.java
new file mode 100644
index 0000000..7a0bc66
--- /dev/null
+++ b/src/main/java/ru/ulstu/timeline/service/EventScheduler.java
@@ -0,0 +1,72 @@
+package ru.ulstu.timeline.service;
+
+import com.google.common.collect.ImmutableMap;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Service;
+import ru.ulstu.core.util.DateUtils;
+import ru.ulstu.timeline.model.Event;
+import ru.ulstu.timeline.model.PeriodEvent;
+import ru.ulstu.user.service.MailService;
+
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+
+@Service
+public class EventScheduler {
+
+    private final Logger log = LoggerFactory.getLogger(EventScheduler.class);
+    private final EventService eventService;
+    private final MailService mailService;
+
+    public EventScheduler(EventService eventService,
+                          MailService mailService) {
+        this.eventService = eventService;
+        this.mailService = mailService;
+    }
+
+    @Scheduled(cron = "0 0 8 * * ?")
+    public void sendNotifications() {
+        List<Event> events = eventService.findByCurrentDate();
+        events.forEach(event -> {
+            Map<String, Object> variables = ImmutableMap.of("description", event.getDescription());
+            event.getRecipients()
+                    .forEach(recipient -> mailService.sendEmailFromTemplate(variables, recipient, "eventNotification", event.getTitle()));
+        });
+    }
+
+    @Scheduled(cron = "0 0 * * * ?")
+    public void checkPeriodEvents() {
+        log.debug("EventScheduler.checkPeriodEvents started");
+        for (Event event : eventService.findAllFuture()) {
+            if (halfOfThePeriodHasPassed(event)) {
+                eventService.createBasedOn(event, DateUtils.addDays(event.getExecuteDate(), getShiftInDays(event.getPeriod())));
+            }
+        }
+
+        log.debug("EventScheduler.checkPeriodEvents finished");
+    }
+
+    private int getShiftInDays(PeriodEvent periodEvent) {
+        switch (periodEvent) {
+            case EVERY_DAY:
+                return periodEvent.getPeriod().getDays();
+            case EVERY_WEEK:
+                return periodEvent.getPeriod().getDays();
+            case EVERY_MONTH:
+                return periodEvent.getPeriod().getMonths() * 30;
+            case EVERY_YEAR:
+                return periodEvent.getPeriod().getYears() * 365;
+            default:
+                throw new RuntimeException("period event not exists");
+        }
+    }
+
+    private boolean halfOfThePeriodHasPassed(Event event) {
+        return event.getPeriod() != null && event.getChild() == null
+                && new Date().after(
+                        DateUtils.addDays(event.getExecuteDate(), (int) -Math.round((double) getShiftInDays(event.getPeriod()) / 2)));
+    }
+}
diff --git a/src/main/java/ru/ulstu/timeline/service/EventService.java b/src/main/java/ru/ulstu/timeline/service/EventService.java
index 8d8189d..602e7aa 100644
--- a/src/main/java/ru/ulstu/timeline/service/EventService.java
+++ b/src/main/java/ru/ulstu/timeline/service/EventService.java
@@ -1,18 +1,15 @@
 package ru.ulstu.timeline.service;
 
-import com.google.common.collect.ImmutableMap;
-import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import ru.ulstu.timeline.model.Event;
 import ru.ulstu.timeline.model.EventDto;
 import ru.ulstu.timeline.repository.EventRepository;
 import ru.ulstu.user.model.UserDto;
-import ru.ulstu.user.service.MailService;
 import ru.ulstu.user.service.UserService;
 
+import java.util.Date;
 import java.util.List;
-import java.util.Map;
 
 import static ru.ulstu.core.util.StreamApiUtils.convert;
 
@@ -21,18 +18,19 @@ public class EventService {
 
     private final EventRepository eventRepository;
     private final UserService userService;
-    private final MailService mailService;
 
     public EventService(EventRepository eventRepository,
-                        UserService userService,
-                        MailService mailService) {
+                        UserService userService) {
         this.eventRepository = eventRepository;
         this.userService = userService;
-        this.mailService = mailService;
     }
 
-    public List<EventDto> findAll() {
-        return convert(eventRepository.findAll(), EventDto::new);
+    public List<EventDto> findAllDto() {
+        return convert(findAll(), EventDto::new);
+    }
+
+    public List<Event> findAll() {
+        return eventRepository.findAll();
     }
 
     @Transactional
@@ -42,12 +40,13 @@ public class EventService {
 
     private Event copyFromDto(Event event, EventDto eventDto) {
         event.setExecuteDate(eventDto.getExecuteDate());
-        event.setCreateDate(eventDto.getCreateDate());
+        event.setCreateDate(eventDto.getId() == null ? new Date() : eventDto.getCreateDate());
         event.setDescription(eventDto.getDescription());
         event.setRecipients(userService.findByIds(convert(eventDto.getRecipients(), UserDto::getId)));
         event.setTitle(eventDto.getTitle());
+        event.setPeriod(eventDto.getPeriod());
         event.setStatus(eventDto.getStatus());
-        event.setUpdateDate(eventDto.getUpdateDate());
+        event.setUpdateDate(new Date());
         return event;
     }
 
@@ -67,13 +66,28 @@ public class EventService {
         return eventRepository.findAll(ids);
     }
 
-    @Scheduled(cron = "0 0 8 * * ?")
-    public void sendNotifications() {
-        List<Event> events = eventRepository.findByCurrentDate();
-        events.forEach(event -> {
-            Map<String, Object> variables = ImmutableMap.of("description", event.getDescription());
-            event.getRecipients()
-                    .forEach(recipient -> mailService.sendEmailFromTemplate(variables, recipient, "eventNotification", event.getTitle()));
-        });
+    public void createBasedOn(Event event, Date executeDate) {
+        //backup event id
+        Integer parentEventId = event.getId();
+
+        event.setId(null);
+        event.setStatus(Event.EventStatus.POSSIBLE);
+        event.setExecuteDate(executeDate);
+        event.setCreateDate(new Date());
+        event.setUpdateDate(new Date());
+        event = eventRepository.save(event);
+
+        //set child to parent
+        Event parentEvent = eventRepository.findOne(parentEventId);
+        parentEvent.setChild(event);
+        eventRepository.save(parentEvent);
+    }
+
+    public List<Event> findByCurrentDate() {
+        return eventRepository.findByCurrentDate();
+    }
+
+    public List<Event> findAllFuture() {
+        return eventRepository.findAllFuture();
     }
 }
diff --git a/src/main/resources/db/changelog-20181111_000000-schema.xml b/src/main/resources/db/changelog-20181111_000000-schema.xml
new file mode 100644
index 0000000..1aa0c64
--- /dev/null
+++ b/src/main/resources/db/changelog-20181111_000000-schema.xml
@@ -0,0 +1,26 @@
+<?xml version="1.1" encoding="UTF-8" standalone="no"?>
+<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.1.xsd">
+    <changeSet author="orion" id="20181111_000000-1">
+        <preConditions  onFail="MARK_RAN">
+            <not><columnExists columnName="period" tableName="event"/></not>
+        </preConditions>
+        <addColumn tableName="event">
+            <column name="period" type="varchar(50)"/>
+        </addColumn>
+    </changeSet>
+    <changeSet author="orion" id="20181111_000000-2">
+        <preConditions  onFail="MARK_RAN">
+            <not><columnExists columnName="child_id" tableName="event"/></not>
+        </preConditions>
+        <addColumn tableName="event">
+            <column name="child_id" type="integer"/>
+        </addColumn>
+    </changeSet>
+    <changeSet author="orion" id="20181111_000000-3">
+        <addForeignKeyConstraint baseTableName="event" baseColumnNames="child_id"
+                                 constraintName="fk_event_child_event" referencedTableName="event"
+                                 referencedColumnNames="id"/>
+    </changeSet>
+</databaseChangeLog>
\ No newline at end of file
diff --git a/src/main/resources/db/changelog-master.xml b/src/main/resources/db/changelog-master.xml
index b5d2999..d0199a1 100644
--- a/src/main/resources/db/changelog-master.xml
+++ b/src/main/resources/db/changelog-master.xml
@@ -15,4 +15,5 @@
     <include file="db/changelog-20181030_000000-schema.xml"/>
     <include file="db/changelog-20181031_000000-schema.xml"/>
     <include file="db/changelog-20181108_000000-data.xml"/>
+    <include file="db/changelog-20181111_000000-schema.xml"/>
 </databaseChangeLog>
\ No newline at end of file